Finding the Fourth Proportional to 1,321.47, 1,822.82 and 849.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.47 : 1,822.82 = 849.20 : x
2. Step 2: Convert to fraction form
   1,321.47/1,822.82 = 849.20/x
3. Step 3: Cross multiply
   1,321.47x = 1,822.82 × 849.20
4. Step 4: Simplify right side
   1,321.47x = 1,547,945.42
5. Step 5: Solve for x
   x = 1,547,945.42/1,321.47
6. Step 6: Final answer
   x = 1,171.38